Oracle Open Sources TopLink Java ORM

Eric^2 writes "Oracle announced on Tuesday that TopLink will now be open source and a full-fledged Eclipse project. TopLink is an object-persistence layer for Java that maps Java objects to a relational database."

old bad memories

[rossifer]

Way back in the day (2001), I was evaluating ORM solutions to replace the "roll-our-own" orm in our Java app. Took a look at Cocobase, TopLink, JDO (just appearing), and Java Relational Bridge. Hibernate was not ready for prime time (yet).

TopLink was the only offering that ate it's own database on a regular basis. I fell back to hourly saves, and making full copies of the XML text that they were using to save the O-R mapping information. At one point, I accidentally overwrote one of the prior saves and discovered that all saves over the last day had been corrupt anyway, and I gave up on the pretty tool. Then we went to fell back to hand-editing mapping files and modifying our domain objects to fit into the framework. Ouch. Lots of references to *.toplink.* appeared in the import lists. Several relationships didn't have strong support (map of named sets: had to make a new object type for the map, trinary relation: again, make a new kludge class).

Nowadays, if you don't HAVE to use stored procedures, use Hibernate. You'll have to adapt your code to it in a few small ways (cascade delete sequencing, persisting inherited properties), but basically, it just works.

Ross

If you aren't using Hibernate....

[Safety Cap]

WTF are you doing?

Re:If you aren't using Hibernate....

[cs02rm0]

Using ibatis [apache.org] because it's easy if you already have SQL gurus, performs better and integrates with an existing data model more easily.